Power-shears.



B. M. CARTWRBGHT.

POWER SHEARS.

APPLICATION FILED SEPT. I4. 1916.

Patented. Aug. 13, 1918.

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BURIED M. CARE-WRIGHT, 01" SYRACUSE, NEW YORK.

rowan-shrines.

Specification of Letters Patent. Patented All". 13, 1918 Application filed September 14, 1916. Serial No. 120,074.

To all whom it may concern: 1

Be it known that I, BURR M. CAnrwnroi-rr, a citizen of the United States, and a resident of Syracuse, in the county of Onondaga and State of New York, have invented a certain new and useful PowerShears, of which the following is a specification.

This invention has for its object power actuating implements as shears, which are particularly simple in construction, easily controlled in their operation, and highly eflicient and durable in use; and it consists in the combinations and constructions hereinafter set. forth and claimed. 1

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is an elevation, partly in section, of one form of this implement.

Fig. 2 is a plan view, partly broken away, of parts seen in Fig.

Fig. 3 is an elevation partly in section, the jaws or blades being shown as open.

Fig. 4 is an enlarged sectional view of the valve and contiguous parts seen in Fig. 2.

Fig. 5 is a sectional view on line 5-5, Fig. 4.

Fig. 6 is an end elevation looking to the left in Fig. 2. 9 i i This power implement comprises gener ally, a body, a frame, a pair of jaws pivoted between their ends, a reciprocating rod guided in the frame, levers connecting the ends of the rod and the rear ends of the jaws, means as links pivoted to the frame and to the levers to hold the pivotal connection between the levers and the jaws from fore and aft movement, and power actuating means associated with the body and connected to the rod.

1 designates the jaws which are pivpted at 2 to plates or straps 3, 4 located on opposite sides of the jaws.

5 the reciprocating rod suitably in Olthe frame 6, and having a head 7 en 8 are levers pivoted atlike ends at 9 to the head 7 and intermediate of their ends at 10 to the rear arms 11 of the jaws 1.

As here shown, these arms 11 are provided with adjustable extensions 12 to which the links 8 are pivoted.

These extensions 12 are pivoted at 13 to the major parts of the arms 11 and the rear arms of these extensions are pivoted to the guided at one levers 8 while the front arms thereof extend outwardly to the outside of the major parts of the jaws 11 and carry adj usting means as set screws 14 which bear on the outer edges of the rear arms 11 of the jaws 1. By turning the screws 14, the jaws 1 are moved slightly on their pivots 2 relatively to the arms, for adjusting the positions of their cutting edges. The levers 8 are here shown as angular in form and the extensions 12 are pivotedto the levers 8 at their angles.

that the aws receive the fullpower from the rod5 throughthe levers 8.

. The body or frame 6 formed with a cyllnder 19 having-a forwardly extending hollow Stem which is closed by a plug 20 in which the rod 5 slides and to which the links 16 are pivoted. The cylinder has a head 19 at its rear end which is formed with a central extension 21.

22 is a piston movable in the cylinder, this piston being mounted on and fixed to the 3 rod 5 WhlCl'l 1s hollow, the passage thereof opening through its rear end, the rod extending beyond the piston and the projecting portion thereof constituting a tail rod movable in the extension 21 of the head 19 The tail rod portion 23 of the rod 5 is of less diameter than the internal passage 24 of the extension 21, and is guided in a bushing 26 in the end of the passage 24 adjacent the cylinder. The extension 21 is also provided with an entrance chamber 27 at its outer end having an internally threaded nipple 28 for connection with a suitable supply of compressed air or other motive fluid. This extension 21 is also provided with a lengthwise passage 29 connecting the chamber 27 and the cylinder on the rearside of the piston and with a transverse valve passage 30 intersecting the passage 29 and also with a laterally extending passage or by-pass 31 opening at one end'into the passage 24 and at its other end into the valve passage 30. A work hole connects the passage 24 and the entrance chamber 27 which hole is normally closed by a plug 32.

The means for controlling the flow of motive fluid as compressed air to from the cylinder comprises a valve 33 IIIOX tblfil reciprocally in the passage 30 having a transverse main passage 34L movable into alinement with the sections of the passage 29 on opposite sides of the valve, an exhaust passage 3 extending lengthwise thereof and comprising a laterally extending part '35 movable into and out registration with the inner section of the passage 29, and also having a vertically extending'byepass 36 for connecting the outer section of the passage 39 on the rear side of the valve with the transverse passage 31. A spring 37 normally holds the valve with the transverse passage 34 out of alinement with the passage 29. That is, with the parts in the position shown in Figs. 2 and 4t.

lllflien it is desired tooperate the shears .to open the same the valve 33 is depressed bringing the passage 3:1 into alinement with the passage 29 whereby the air passes through chamber 27, passage 2-9 into the cylinder and thereby moves the piston to'the left into the position shown in Fig. 1.

For opening the shears, the valve is allowed to return'to its normal position under the influence of its spring 3'? so that the air passes from chamber 27, passage 2-9 to the valve through the by pass 36 of thevalve to the lateral passage 31 into the passage 24 of the extension of the cylinder through the tail rod '23, and through the lateral passage 38 into the cylinder in front of the piston, moving the piston and the parts from the position shown in Fig. 1.

During the movement of the piston to the, right, Fig. l, the air on the rear or right side of the piston exhausts through themner section of passage 39, passages 34* and '35 of the valve 33, in which the valve spring 37 is located,-then through exhaust pass ges L0.

During the movement of the piston to the position shown in Fig. 1 the air from the front or left side of the piston exhausts through the passages 38 of the rod 5, tail rod 23, passage 24, lateral passage 31, by pass 36 of the valve 33 which is now connecting the passages 31 with the exhaust passage 4:0.

What I claim is: 1 A power cutter com-prising a frame, a

. pair of jaws p ot bet ee their ends,

tuatilolg m ns including a rod reciprocally mov ble 1n the rame, means conne ting the rear ends of the w to the rod i ludi levers pivoted at corresponding ends to the rod and pivotally connected between their ends to the jaws, and means connecting the levers and the frame to hold the pivotal connection between the lovers and the jaws from fore and aft movement, substantially as and for the purpose described.

A power cutter comprising a frame, a pair of jaws, means for operating the jaws comprising a reciprocating rod guided in the frame, levers pivoted at like ends to the rod and between their ends to the rear ends of the jaws, links pivoted to the other ends of said levers and to the frame and means for reciprocating the rod, substantially as and for the purpose specified.

3. A power cutter comprising a frame having a cylinder and handles, one being in front of the cylinder in axial alinement there-with, a pair of jaws, a piston movable in the cylinder and having a rod extending through the front handle and. operatively connected to the jaws, and means adjacent one of the handles for controlling the flow of motive fluid to the cylinder, substantially as and for the purpose set forth.

4. A power cutter comprising a frame having a cylinder and handles in the front and the rear of the cylinder in axial alinement, a pair of jaws, a piston movable in the cylinder and having" a rod extending through thefront handle and operatiw ly connected to the jaws and means associated with .one of the handles for controlling the flow of the motive fluid to the cylinder, substantially as and for the purpose described.

5. power cutter comprising a frame in the form of a cylinder, handles on the cylinder, one being in front of the cylinder, a piston movable in the cylinder and having its rod extending forwardly through the front handle, a pair of jaws and means for supporting and operating the jaws. said means being located at the front end of the rod and connected thereto and means connected to the jaws and t0 the front end of the front handle for preventing forward and rearward movement of the jaws during the forward and rearward movement of the rod, substantially as and for the purpose specified.

In testimony whereof, I have hereunto signed my name, at Syracuse, in the county of O on ga, and State of New York, this 7th day of September, 1916.

' BURR M. CARTlVRIGHT.

a jned. for five cents each, by addressing the Commissioner of Patents,

Wesh swn, D- 9-" 

